Convert ppm/°F to ppm/K
1 ppm per degree Fahrenheit (ppm/°F) = 1.8 ppm per kelvin (ppm/K). 1 ppm/K = 0.5555555556 ppm/°F. Example: 6.5 ppm/°F = 6.5 × 1.8 = 11.7 ppm/K.
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1 ppm/°F = 1.8 ppm/K
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ppm per degree Fahrenheit to ppm per kelvin converter to paste a column from Excel.
How to Convert ppm/°F to ppm/K
- 1 ppm/°F = 1.8 ppm/K
- 1 ppm/K = 0.5555555556 ppm/°F
- Example: convert 6.5 ppm/°F to ppm/K: 6.5 ppm/°F = 6.5 × 1.8 ppm/K = 11.7 ppm/K
Formula
ppm/K = ppm/°F × 1.8
Derivation from SI units:
- 1 ppm/°F = 10⁻⁶ /°F = 1.8 × 10⁻⁶ K⁻¹ = 1 µin/(in·°F)
- 1 ppm/K = 10⁻⁶ K⁻¹ = 1 µm/(m·K) = 1 µm/(m·°C)
- 1 ppm/°F = 0.0000018 K⁻¹ ÷ 0.000001 K⁻¹ per ppm/K = 1.8 ppm/K
Both units are defined exactly, so the factor is exact. ppm/°F definition: ppm per degree Fahrenheit; ppm/K definition: ppm per kelvin.
Worked examples
- Steel at 6.5 ppm/°F is 11.7 ppm/K.
6.5 ppm/°F × 1.8 = 11.7 ppm/K - Stainless steel 304 at about 9.6 ppm/°F is 17.28 ppm/K.
9.6 ppm/°F × 1.8 = 17.28 ppm/K
ppm/°F to ppm/K conversion table
| ppm/°F | ppm/K |
|---|---|
| 0.3 ppm/°F | 0.54 ppm/K |
| 1 ppm/°F | 1.8 ppm/K |
| 3 ppm/°F | 5.4 ppm/K |
| 5 ppm/°F | 9 ppm/K |
| 6.5 ppm/°F | 11.7 ppm/K |
| 7 ppm/°F | 12.6 ppm/K |
| 9.6 ppm/°F | 17.28 ppm/K |
| 12.8 ppm/°F | 23.04 ppm/K |
| 20 ppm/°F | 36 ppm/K |
| 50 ppm/°F | 90 ppm/K |
Where it's used
US datasheet values in µin/(in·°F) are converted to ppm/K or µm/(m·°C) for metric design and ISO material data. Multiply by 1.8.
ppm/°F to other thermal expansion coefficient units
| Conversion | 1 ppm/°F equals |
|---|---|
| ppm per degree Fahrenheit to ppm per kelvin | 1.8 ppm/K |
| ppm per degree Fahrenheit to per kelvin | 0.0000018 K⁻¹ |
| ppm per degree Fahrenheit to per degree Celsius | 0.0000018 °C⁻¹ |
| ppm per degree Fahrenheit to per degree Fahrenheit | 0.000001 °F⁻¹ |
Frequently asked questions
Is µin/in·°F the same as ppm/°F?
Yes. A microinch per inch is one part per million, so both mean 10⁻⁶ per °F.
How many ppm per kelvin are in 1 ppm per degree Fahrenheit?
1 ppm/°F = 1.8 ppm/K.
How do I convert ppm per degree Fahrenheit to ppm per kelvin?
Multiply the value in ppm/°F by 1.8. For example, 6.5 ppm/°F × 1.8 = 11.7 ppm/K.
Is the ppm/°F to ppm/K conversion exact?
Yes. Both units are defined exactly, and 1 ppm/°F is exactly 1.8 ppm/K.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "degree Fahrenheit".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, degree Celsius.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert ppm/°F to ppm/K. Retrieved October 25, 2026, from https://scientificconverters.com/thermal-expansion/ppm-per-degree-fahrenheit-to-ppm-per-kelvin/
IEEE
Scientific Converters, "Convert ppm/°F to ppm/K," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-expansion/ppm-per-degree-fahrenheit-to-ppm-per-kelvin/